Addsd the text renderer and internal font (Open-Sans.ttf)
Some graphics testing code added to the core game loopGui_Panel_Refactor
Joeyrp
4 years ago
parent
6afa6d8505
commit
7919f34d01
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/******************************************************************************
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* File - InternalFont.h
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* Author - Joey Pollack
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* Date - 2020/01/08 (y/m/d)
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* Mod Date - 2021/09/07 (y/m/d)
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* Description - Generates a font file (from OpenSans-Regular.ttf)
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*
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******************************************************************************/
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#include "InternalFont.h"
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#include "InternalFontData.h"
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#include <utils/logger.h>
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#include <fstream>
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namespace lunarium
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{
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bool GenerateFontFileAt(const char * filename)
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{
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std::ofstream ofs(filename, std::ios_base::binary);
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if (!ofs.is_open())
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{
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Logger::Log(LogCategory::GRAPHICS, LogLevel::WARNING, "Could not generate the default font file at: %s", filename);
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return false;
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}
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ofs.write((const char*)FontData, DataSize);
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ofs.close();
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ofs.clear();
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return true;
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}
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}
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/******************************************************************************
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* File - InternalFont.h
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* Author - Joey Pollack
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* Date - 2020/01/08 (y/m/d)
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* Mod Date - 2020/01/08 (y/m/d)
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* Description - Generates a font file (from OpenSans-Regular.ttf)
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*
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******************************************************************************/
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#ifndef INTERNAL_FONT_H_
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#define INTERNAL_FONT_H_
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namespace lunarium
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{
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bool GenerateFontFileAt(const char* filename);
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}
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#endif // INTERNAL_FONT_H_
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File diff suppressed because it is too large
Load Diff
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/******************************************************************************
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* File - glText.cpp
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* Author - Joey Pollack
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* Date - 2021/09/07 (y/m/d)
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* Mod Date - 2021/09/07 (y/m/d)
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* Description - Used to load and manage fonts. Renders text using freetype
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* and openGL.
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******************************************************************************/
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#include "glText.h"
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#include <utils/logger.h>
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#include <glm/gtc/matrix_transform.hpp>
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#include <glm/gtc/type_ptr.hpp>
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#include <ft2build.h>
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#include FT_FREETYPE_H
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namespace lunarium
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{
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int glText::LoadFont(const char* fontFile, float size, int weight)
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{
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if (!mTextShader.IsBuilt())
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{
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Logger::Log(LogCategory::GRAPHICS, LogLevel::ERROR, "Unable to load font because no text rendering shaders are loaded");
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return -1;
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}
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FT_Library ft;
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if (FT_Init_FreeType(&ft))
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{
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Logger::Log(LogCategory::GRAPHICS, LogLevel::ERROR, "FREETYPE: Could not init FreeType Library");
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return -1;
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}
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FT_Face face;
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if (FT_New_Face(ft, fontFile, 0, &face))
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{
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Logger::Log(LogCategory::GRAPHICS, LogLevel::ERROR, "FREETYPE: Failed to load font from file: %s", fontFile);
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return -1;
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}
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FT_Set_Pixel_Sizes(face, 0, 48);
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1); // Disable byte-alignment restriction
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// NOTE: Testing code
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float sizes[128] = { 0.0f };
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mFonts.push_back(Font());
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int fontIdx = (int)(mFonts.size() - 1);
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for (GLubyte c = 0; c < 128; c++)
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{
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// Load character glyph
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if (FT_Load_Char(face, c, FT_LOAD_RENDER))
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{
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Logger::Log(LogCategory::GRAPHICS, LogLevel::ERROR, "FREETYTPE: Failed to load Glyph %c from font file %s", c, fontFile);
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continue;
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}
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// Generate texture
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GLuint texture;
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glGenTextures(1, &texture);
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glBindTexture(GL_TEXTURE_2D, texture);
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glTexImage2D(
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GL_TEXTURE_2D,
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0,
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GL_RED,
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face->glyph->bitmap.width,
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face->glyph->bitmap.rows,
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0,
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GL_RED,
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GL_UNSIGNED_BYTE,
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face->glyph->bitmap.buffer
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);
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// Set texture options
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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// Now store character for later use
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Character character = {
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texture,
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{ (float)face->glyph->bitmap.width, (float)face->glyph->bitmap.rows },
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glm::vec2((float)face->glyph->bitmap_left, (float)face->glyph->bitmap_top),
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(int)face->glyph->bitmap.rows - face->glyph->bitmap_top,
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(unsigned int)face->glyph->advance.x
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};
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mFonts.back().CharSet.insert(std::pair<GLchar, Character>(c, character));
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// Find Max (positive) Down Shift
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if (character.DownShift > 0 && ((int)mFonts.back().MaxDownShift) < character.DownShift)
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{
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mFonts.back().MaxDownShift = character.DownShift;
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}
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// Determines the distance from the top down to the baseline
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if (character.Size.Height == character.Bearing.y && mFonts.back().MaxHeight < character.Size.Height)
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{
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mFonts.back().MaxHeight = (unsigned int)character.Size.Height;
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}
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}
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FT_Done_Face(face);
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FT_Done_FreeType(ft);
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return fontIdx;
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}
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OpRes glText::Initialize()
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{
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glGenVertexArrays(1, &mTextVAO);
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glGenBuffers(1, &mTextVBO);
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glBindVertexArray(mTextVAO);
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glBindBuffer(GL_ARRAY_BUFFER, mTextVBO);
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glBufferData(GL_ARRAY_BUFFER, sizeof(GLfloat) * 6 * 4, NULL, GL_DYNAMIC_DRAW);
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glEnableVertexAttribArray(0);
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glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, 4 * sizeof(GLfloat), 0);
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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glBindVertexArray(0);
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// Load text shaders
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mTextShader.SetSource(glShader::TYPE_VERTEX, VertShader, false);
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mTextShader.SetSource(glShader::TYPE_FRAGMENT, FragShader, false);
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if (!mTextShader.BuildProgram())
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{
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return OpRes::Fail("Unable to build text shader program. Fonts will not load and text will not render.");
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}
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return OpRes::OK();
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}
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void glText::DrawString(int fontID, const char* text, glm::vec2 position, Color color, float scale, glm::mat4 projection)
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{
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// HACK: There might be a better way to specify no limit to the bottom right
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DrawString(fontID, text, position, glm::vec2(9000000.0f, 9000000.0f), color, scale, projection);
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}
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void glText::DrawString(int fontID, const char* text, glm::vec2 topLeft, glm::vec2 botRight, Color color, float scale, glm::mat4 projection)
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{
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if (!mTextShader.IsBuilt())
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{
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Logger::Log(LogCategory::GRAPHICS, LogLevel::ERROR, "Unable to draw string because no text rendering shaders are loaded");
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return;
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}
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if (fontID < 0 || fontID >= mFonts.size())
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{
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Logger::Log(LogCategory::GRAPHICS, LogLevel::ERROR, "Invalid font ID specified for DrawString: %d", fontID);
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return;
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}
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//glEnable(GL_BLEND);
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//glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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// NOTE: String drawing code based on code from: https://learnopengl.com/In-Practice/Text-Rendering
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mTextShader.MakeActive();
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mTextShader.SetUniformMatrix("projection", 1, glm::value_ptr(projection));
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mTextShader.SetUniformf("textColor", { color.Red, color.Green, color.Blue, color.Alpha });
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glActiveTexture(GL_TEXTURE0);
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glBindVertexArray(mTextVAO);
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float lineSize = (mFonts[fontID].MaxHeight + mFonts[fontID].MaxDownShift) * scale;
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float curX = topLeft.x;
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float curY = topLeft.y;
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// Iterate through all characters
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int len = (int)strlen(text);
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for (int c = 0; c < len; c++)
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{
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Character ch = mFonts[fontID].CharSet[text[c]];
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GLfloat advance = (ch.Advance >> 6) * scale;
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if (curX + advance > botRight.x)
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{
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curX = topLeft.x;
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curY += lineSize;
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}
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if (curY + lineSize > botRight.y)
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{
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break;
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}
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GLfloat xpos = curX + ch.Bearing.x * scale;
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GLfloat ypos = curY + (mFonts[fontID].MaxHeight - ch.Size.Height) * scale;
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// Apply a down offset if the char should go below the baseline
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ypos += (ch.DownShift * scale);
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// NOTE: The following code does not work because it assumes that positive y is the upward direction
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//
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//GLfloat test_ypos = curY + (ch.Size.Height - ch.Bearing.Y) * scale;
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//
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GLfloat w = ch.Size.Width * scale;
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GLfloat h = ch.Size.Height * scale;
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// Update VBO for each character
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GLfloat vertices[6][4] = {
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{ xpos, ypos + h, 0.0, 1.0 },
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{ xpos + w, ypos, 1.0, 0.0 },
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{ xpos, ypos, 0.0, 0.0 },
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{ xpos, ypos + h, 0.0, 1.0 },
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{ xpos + w, ypos + h, 1.0, 1.0 },
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{ xpos + w, ypos, 1.0, 0.0 }
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};
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// Render glyph texture over quad
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glBindTexture(GL_TEXTURE_2D, ch.TextureID);
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// Update content of VBO memory
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glBindBuffer(GL_ARRAY_BUFFER, mTextVBO);
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glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(vertices), vertices);
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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// Render quad
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glDrawArrays(GL_TRIANGLES, 0, 6);
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// Now advance cursors for next glyph (note that advance is number of 1/64 pixels)
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curX += (ch.Advance >> 6) * scale; // Bitshift by 6 to get value in pixels (2^6 = 64)
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}
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glBindVertexArray(0);
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glBindTexture(GL_TEXTURE_2D, 0);
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}
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}
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@ -0,0 +1,90 @@
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/******************************************************************************
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* File - glText.h
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* Author - Joey Pollack
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* Date - 2021/09/07 (y/m/d)
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* Mod Date - 2021/09/07 (y/m/d)
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* Description - Used to load and manage fonts. Renders text using freetype
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* and openGL.
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******************************************************************************/
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#ifndef GL_TEXT_H_
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#define GL_TEXT_H_
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#include <map>
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#include <vector>
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#include <glad/gl.h>
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#include "glShader.h"
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#include <utils/opRes.h>
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#include <utils/types.h>
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#include <glm/glm.hpp>
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namespace lunarium
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{
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class glText
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{
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public:
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OpRes Initialize();
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int LoadFont(const char* fontFile, float size = 12.0f, int weight = 400);
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void DrawString(int fontID, const char* text, glm::vec2 position, Color color, float scale, glm::mat4 projection);
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void DrawString(int fontID, const char* text, glm::vec2 topLeft, glm::vec2 botRight, Color color, float scale, glm::mat4 projection);
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private:
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struct Character
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{
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unsigned int TextureID; // ID handle of the glyph texture
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Sizef Size; // Size of glyph
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glm::vec2 Bearing; // Offset from baseline to left/top of glyph
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int DownShift; // Size/Amount of glyph below the baseline
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unsigned int Advance; // Offset to advance to next glyph
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};
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struct Font
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{
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// The tallest character that does not go below the base line
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// This is also the distance from the string Y position to the baseline
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unsigned int MaxHeight;
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// This is the max distance a char will go below the baseline
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unsigned int MaxDownShift;
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std::map<char, Character> CharSet;
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Font() : MaxHeight(0), MaxDownShift(0)
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{}
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};
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std::vector<Font> mFonts;
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GLuint mTextVAO;
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GLuint mTextVBO;
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glShader mTextShader;
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private: // SHADER CODE
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const char* VertShader = "#version 450 core\n\
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layout(location = 0) in vec4 vertex; \
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out vec2 TexCoords;\
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\
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uniform mat4 projection;\
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\
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void main()\
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{\
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gl_Position = projection * vec4(vertex.xy, 0.0, 1.0);\
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TexCoords = vertex.zw;\
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} ";
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const char* FragShader = "#version 450 core\n\
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in vec2 TexCoords;\
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out vec4 color;\
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\
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uniform sampler2D text;\
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uniform vec4 textColor;\
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\
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void main()\
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{\
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vec4 sampled = vec4(1.0, 1.0, 1.0, texture(text, TexCoords).r);\
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color = vec4(textColor) * sampled;\
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}";
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};
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}
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#endif // GL_TEXT_H_
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